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is a significant concern for physicians. Central
# r0 M6 w( \3 a M2 K4 jprecocious puberty (CPP), which is mediated5 j" L9 r; C; }; }# A$ p
through the hypothalamic pituitary gonadal axis, has9 _; V0 p" V3 V
a higher incidence of organic central nervous system
: K9 S' ~" m6 i# {, zlesions in boys.1,2 Virilization in boys, as manifested
?7 G! w/ y* L; L: y$ h7 Uby enlargement of the penis, development of pubic2 ?8 G3 p4 K3 Q# @4 }" F! `+ o: w
hair, and facial acne without enlargement of testi-
! _! ?2 N4 ?- C1 L& I, R+ ocles, suggests peripheral or pseudopuberty.1-3 We. W1 c+ e* o# t$ d2 ^& h
report a 16-month-old boy who presented with the. Z' v8 V; U0 ]! I: \: @" b. a% w+ C& D
enlargement of the phallus and pubic hair develop-
- U: q4 G( j& B9 lment without testicular enlargement, which was due' U `, g- _7 X8 ^6 ?
to the unintentional exposure to androgen gel used by
$ `$ [+ A0 g# _: G- E. Kthe father. The family initially concealed this infor-
/ x, }$ C1 D! ]/ x/ [mation, resulting in an extensive work-up for this% M& h% o" I! f. x
child. Given the widespread and easy availability of8 L" }, H$ u+ C
testosterone gel and cream, we believe this is proba-
$ Y% e& q/ f$ _% O& A9 B e1 p1 ^bly more common than the rare case report in the
# v4 }! [" T" G: Rliterature.4- h# l: x8 ]! Z1 e2 I S. J1 j- r
Patient Report
$ H9 m. o: U9 g' f. HA 16-month-old white child was referred to the
, I9 ^ L4 e$ `3 N$ i. Yendocrine clinic by his pediatrician with the concern" s6 c2 Y& L1 h9 a
of early sexual development. His mother noticed }) J: V2 B8 Y/ U, L
light colored pubic hair development when he was2 S, y* X' _4 j1 `+ r, A
From the 1Division of Pediatric Endocrinology, 2University of! {0 f' I* ?* [# e7 m
South Alabama Medical Center, Mobile, Alabama.7 w2 {! O. Q& L
Address correspondence to: Samar K. Bhowmick, MD, FACE,; H' w& u3 r3 j* ]) S+ S
Professor of Pediatrics, University of South Alabama, College of" B) v$ b' r! t8 {
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;+ S8 H* Y6 H% k5 B: C
e-mail: [email protected].
, m7 Z7 \1 F. ~. i7 W% t- Nabout 6 to 7 months old, which progressively became; V! d8 ~$ x1 J. u) d$ `
darker. She was also concerned about the enlarge-
6 I: b- ]" K, N- Mment of his penis and frequent erections. The child3 K+ G- B/ |: @# f9 L( @* L
was the product of a full-term normal delivery, with
9 e" J& z5 O$ w9 C# i( La birth weight of 7 lb 14 oz, and birth length of1 u* R1 a3 `$ \6 ^. M) i
20 inches. He was breast-fed throughout the first year9 I$ U% J9 ?) w
of life and was still receiving breast milk along with u2 T# s# [9 r! E% N+ t: q
solid food. He had no hospitalizations or surgery,' O* d) ~! [9 k; C
and his psychosocial and psychomotor development2 _& Z4 p' F2 N$ F5 L6 C
was age appropriate.' C; t; R5 Y9 E
The family history was remarkable for the father,
# e; {- @% ^, cwho was diagnosed with hypothyroidism at age 16,/ |7 q5 d2 f3 n8 F/ ~, i
which was treated with thyroxine. The father’s; ]5 P( I8 b4 l2 O, b# V
height was 6 feet, and he went through a somewhat
/ ~0 d# A! O1 b' \. ~! hearly puberty and had stopped growing by age 14.
! I. u, c& B& h/ b; B$ CThe father denied taking any other medication. The, [& U+ |8 B- h( r% {0 V
child’s mother was in good health. Her menarche
, _* L8 g L, Y" U5 m; Ewas at 11 years of age, and her height was at 5 feet
4 j+ p+ N& P' q. |8 U& ]( D: I* |5 inches. There was no other family history of pre-5 b$ V3 y; y# e
cocious sexual development in the first-degree rela-
( h) A) m$ l- s2 C$ {tives. There were no siblings.
& t" K B" N' M" Q7 Q! kPhysical Examination% D6 }' j5 p/ ?7 B# |
The physical examination revealed a very active,6 ]6 @( m8 y" T% f6 k4 s
playful, and healthy boy. The vital signs documented' W4 ~- }! s u
a blood pressure of 85/50 mm Hg, his length was
# B- I# o4 J. d" D8 _" T90 cm (>97th percentile), and his weight was 14.4 kg
% E; t# z/ f3 d(also >97th percentile). The observed yearly growth: |) q6 m5 F+ t' b0 q( S
velocity was 30 cm (12 inches). The examination of+ B; n+ x. t: f. R$ ?' S4 R! Z
the neck revealed no thyroid enlargement.
% Y0 }( l# C G1 E1 u$ ]7 ^: _The genitourinary examination was remarkable for# n5 J& A P7 ]" N) ?& B2 p
enlargement of the penis, with a stretched length of
) a, i8 A( e0 o# k/ y/ o' A8 O j- u8 cm and a width of 2 cm. The glans penis was very well
W, b6 p% u7 \) y. @developed. The pubic hair was Tanner II, mostly around
7 X* O3 ^3 f2 z M4 a' B7 h540
3 \, {6 [. E- y& [2 O jat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
" ~* y: U1 |, p; Uthe base of the phallus and was dark and curled. The
& e# I% a: c+ R; u; Atesticular volume was prepubertal at 2 mL each.
- t' a4 a0 `' h5 t }The skin was moist and smooth and somewhat
# `4 u! `! `) w- Voily. No axillary hair was noted. There were no; O, m: Q5 E$ f* E1 J
abnormal skin pigmentations or café-au-lait spots.4 }3 X8 E8 }7 |
Neurologic evaluation showed deep tendon reflex 2+
6 h6 `( |% c; L7 A- Fbilateral and symmetrical. There was no suggestion
, B. P+ Q( [) g( yof papilledema.
2 C8 z2 q4 }3 p3 u5 iLaboratory Evaluation. Q! L: N( t/ G/ K
The bone age was consistent with 28 months by
0 Z7 T) |; T( Z0 eusing the standard of Greulich and Pyle at a chrono-' j3 p- E* ?& R0 C
logic age of 16 months (advanced).5 Chromosomal) D$ \7 r" l2 N1 c( j) p" E
karyotype was 46XY. The thyroid function test& _2 k9 {/ ]! C, N
showed a free T4 of 1.69 ng/dL, and thyroid stimu-4 k4 b& S4 n. [
lating hormone level was 1.3 µIU/mL (both normal).: R8 s+ t3 K) o- `
The concentrations of serum electrolytes, blood0 Y9 ], r5 R" P9 B2 E
urea nitrogen, creatinine, and calcium all were
# e/ z/ [3 I1 Xwithin normal range for his age. The concentration! ]% {* o; F! K3 _6 A+ D# k
of serum 17-hydroxyprogesterone was 16 ng/dL: t( Z9 `9 H5 a
(normal, 3 to 90 ng/dL), androstenedione was 201 D$ d- q5 P. c- @! _
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
' G" v/ e6 y1 Y( p; fterone was 38 ng/dL (normal, 50 to 760 ng/dL), b# P6 C# M4 w7 _
desoxycorticosterone was 4.3 ng/dL (normal, 7 to: z+ o9 R8 L6 l c Q3 u
49ng/dL), 11-desoxycortisol (specific compound S)
5 q7 O2 g1 U+ Hwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
: @2 c5 g2 C) Y) I# e' ctisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
4 y( n( Y8 c+ s3 p' H- I, mtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 P& W( u) h( p# R! W, O* ~6 Y0 r9 @
and β-human chorionic gonadotropin was less than, _5 i. z& F* X. P' N0 B [6 R
5 mIU/mL (normal <5 mIU/mL). Serum follicular
" Q1 q0 U. c* I5 i; W4 o; Nstimulating hormone and leuteinizing hormone& `5 D- ~# P7 F( B+ C+ J
concentrations were less than 0.05 mIU/mL
& \4 z0 |# _$ l* N! U(prepubertal).2 p6 r5 ~: {3 ?: a: W
The parents were notified about the laboratory
! h" s7 \$ X6 y2 ]. H* \ Presults and were informed that all of the tests were+ F& t6 u4 w2 l) X- w$ N
normal except the testosterone level was high. The
+ u/ P5 ]5 f+ j& wfollow-up visit was arranged within a few weeks to- M/ [* u7 O! W1 D/ S3 B
obtain testicular and abdominal sonograms; how-! n1 b8 V; U; R4 k
ever, the family did not return for 4 months.
' r' G. K* K lPhysical examination at this time revealed that the
: {" X, |8 D' D0 z Ychild had grown 2.5 cm in 4 months and had gained4 R5 k% o4 T* k# v5 q
2 kg of weight. Physical examination remained5 s- Q* i: f* Q6 l7 {: n
unchanged. Surprisingly, the pubic hair almost com-% ?' `* @' z" u4 j& F) k+ Z0 @5 @
pletely disappeared except for a few vellous hairs at
& u8 ]2 x" o8 t) Lthe base of the phallus. Testicular volume was still 2
# |" A+ S9 _6 a" l- C9 |& X9 tmL, and the size of the penis remained unchanged.* z4 ]5 j5 O+ a7 R0 L' J4 H
The mother also said that the boy was no longer hav-2 y" W% l2 b8 Q1 Q9 [
ing frequent erections.& H0 p/ O, I, Z6 ^& k
Both parents were again questioned about use of
5 A) }' N0 Q6 w W* L, U* s/ e8 ~any ointment/creams that they may have applied to
4 w9 H- d9 V) D9 t$ _$ ^6 ]the child’s skin. This time the father admitted the
) H, [ D; x/ g$ ITopical Testosterone Exposure / Bhowmick et al 541
6 u& @4 o; `" p3 f6 v$ Duse of testosterone gel twice daily that he was apply-
8 P! D) O2 U6 A Jing over his own shoulders, chest, and back area for
7 X+ j% c) I5 Ma year. The father also revealed he was embarrassed2 e" a2 Y+ l! p E
to disclose that he was using a testosterone gel pre-
6 W3 o, U, V( z) I' A8 Z) V0 Lscribed by his family physician for decreased libido
; o7 O$ W5 |& r, dsecondary to depression.
" Q% K* [- x" o% P( t, SThe child slept in the same bed with parents.5 O4 W, h9 z! u' `3 q$ a
The father would hug the baby and hold him on his
" L2 _( D k A0 }2 q6 Q, L, Dchest for a considerable period of time, causing sig-6 [0 N" n2 F n/ @, X
nificant bare skin contact between baby and father.) L, f$ }3 a: J' \9 T
The father also admitted that after the phone call,( f! c& P; J0 r
when he learned the testosterone level in the baby2 i7 w: T7 O# W+ \ Z
was high, he then read the product information
! Z) E! N( [; h5 V( {1 x f9 ipacket and concluded that it was most likely the rea-
8 o: t. l3 E1 z: g! I$ sson for the child’s virilization. At that time, they$ A `! z7 K! q4 L" k. I; y W( O
decided to put the baby in a separate bed, and the
4 U8 b, {# A' |! `8 i& `, jfather was not hugging him with bare skin and had
8 T6 [$ z, f7 G0 H* |) Zbeen using protective clothing. A repeat testosterone- E# G* w, _% G8 D$ c$ ?
test was ordered, but the family did not go to the* o: o& e( q' B5 z9 M8 H$ _
laboratory to obtain the test.
. ]& `+ r7 I. p/ z5 {% J8 v9 ODiscussion. M3 \$ v5 k7 q8 O! N
Precocious puberty in boys is defined as secondary
7 Q4 O$ M: |- [) j( lsexual development before 9 years of age.1,4/ k! V, l" t; K: t8 W$ O
Precocious puberty is termed as central (true) when
6 V l: |# ^2 u, K9 vit is caused by the premature activation of hypo-3 G8 G$ |$ B: O4 O7 p! L
thalamic pituitary gonadal axis. CPP is more com- {% B0 a& F! }1 J
mon in girls than in boys.1,3 Most boys with CPP
; |' W8 b. C6 X5 u l# M% fmay have a central nervous system lesion that is
0 U! i; e. w* A3 ]( C9 wresponsible for the early activation of the hypothal-
2 G3 f7 T( o* \amic pituitary gonadal axis.1-3 Thus, greater empha-
2 Y5 A' X$ y3 Z" Q3 H/ e/ B6 i) k5 ysis has been given to neuroradiologic imaging in
$ l' U8 y! {# s# W2 Q0 ]+ Dboys with precocious puberty. In addition to viril-# a- d4 d, H2 b3 T: z% R
ization, the clinical hallmark of CPP is the symmet-: [" f# k4 Z- A. x# \ G8 Y
rical testicular growth secondary to stimulation by' a) P0 b% \' k
gonadotropins.1,3' [9 x5 m2 _+ l; I' Q
Gonadotropin-independent peripheral preco-
$ y* _" ^+ `& v7 B" u' mcious puberty in boys also results from inappropriate
2 Y. J# W9 P, R' @$ landrogenic stimulation from either endogenous or9 D* r; N+ ~* h+ A, a
exogenous sources, nonpituitary gonadotropin stim-0 ~) K% _# X4 f* ?! \+ j
ulation, and rare activating mutations.3 Virilizing2 ^4 O5 f2 Z, D( H0 H2 O
congenital adrenal hyperplasia producing excessive
8 n2 o9 x' ?* Z( c2 badrenal androgens is a common cause of precocious" b- s% j/ I6 F8 Q; N
puberty in boys.3,4
! X, K/ X! ~! d' B, I. J: wThe most common form of congenital adrenal7 _6 g( x# }! e* P& e" X
hyperplasia is the 21-hydroxylase enzyme deficiency.
! g/ Q1 \# K# S7 ~The 11-β hydroxylase deficiency may also result in
$ C. r5 N! \2 w" a I( Yexcessive adrenal androgen production, and rarely,2 i) H: _. p& F8 e' l1 ~) |
an adrenal tumor may also cause adrenal androgen
: e8 i M: u9 }. z! Oexcess.1,3 a P# `4 [, m" | F, t0 {/ T) n& J
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from! q; Z, A2 a! F5 c7 N5 Q
542 Clinical Pediatrics / Vol. 46, No. 6, July 20076 ^$ i4 I, f9 l- D* z0 ?& v
A unique entity of male-limited gonadotropin-3 g* c* P# w. B- C& E7 M9 J
independent precocious puberty, which is also known
4 \0 }1 ~5 ^2 V5 @3 J/ oas testotoxicosis, may cause precocious puberty at a: }3 K. O, w2 ^+ ~8 V
very young age. The physical findings in these boys
6 ^! o8 Q& g- A; s0 r- `with this disorder are full pubertal development,
& x+ B* V7 F' ]including bilateral testicular growth, similar to boys
, b7 N/ |, [& U6 c: N8 M4 D+ Gwith CPP. The gonadotropin levels in this disorder
M2 n/ ~; Y/ @/ |) \6 Mare suppressed to prepubertal levels and do not show
) H. V0 s. u0 b* F; A0 h- jpubertal response of gonadotropin after gonadotropin-: J( o$ M+ G. ]; G- }
releasing hormone stimulation. This is a sex-linked. @- w6 l6 E4 j- H
autosomal dominant disorder that affects only2 j2 \" h/ w! e$ l, T
males; therefore, other male members of the family& p4 s6 A* i/ T: N
may have similar precocious puberty.3
$ i0 T: n: k8 Y& T2 FIn our patient, physical examination was incon-1 i# v/ N* u+ Z% U5 v
sistent with true precocious puberty since his testi-
( r, j6 k8 Y9 R) f3 f) wcles were prepubertal in size. However, testotoxicosis
& u$ z: J; k5 \( m- G. }7 M. R$ S- Gwas in the differential diagnosis because his father
* `: w: @- A8 a! Bstarted puberty somewhat early, and occasionally,
7 r( J4 J/ ?! u& G+ u5 v4 jtesticular enlargement is not that evident in the
" s4 {6 ?; p3 j# H& Lbeginning of this process.1 In the absence of a neg-
; |7 W3 v4 `" e. u' b! `ative initial history of androgen exposure, our7 O# P( m) p3 \9 f( n( M+ M( j/ `( D
biggest concern was virilizing adrenal hyperplasia,
: F9 [( P \* B8 o$ Aeither 21-hydroxylase deficiency or 11-β hydroxylase
# z X$ W7 ` B, b1 @deficiency. Those diagnoses were excluded by find-9 Z; t. i: {4 _5 V5 d7 A
ing the normal level of adrenal steroids.
5 {& ^$ @0 ], E* \6 I8 K* M$ `/ ?/ ZThe diagnosis of exogenous androgens was strongly
( v2 o9 `4 Y% U7 I- b0 tsuspected in a follow-up visit after 4 months because3 |* Y. G! O: h0 M* F' r
the physical examination revealed the complete disap-
/ `; M2 [; v9 k" A' \* S. q% y! y7 n$ Mpearance of pubic hair, normal growth velocity, and* I9 `1 q0 w Z% `! R. p( F5 T
decreased erections. The father admitted using a testos-. q! d! n9 L0 X0 ?6 l+ |! Y
terone gel, which he concealed at first visit. He was! ?- a0 L+ }1 B( l) g( z {
using it rather frequently, twice a day. The Physicians’
' O. O+ f; i5 p6 b tDesk Reference, or package insert of this product, gel or
8 K7 |0 C. ^5 |) j/ d2 @cream, cautions about dermal testosterone transfer to
/ ^8 F2 l4 M2 J7 l7 z7 s7 C( @) n: zunprotected females through direct skin exposure.
7 b y* P. ]. MSerum testosterone level was found to be 2 times the# Y: h, S" P- Q
baseline value in those females who were exposed to: E3 r: m' b4 B4 T8 Q
even 15 minutes of direct skin contact with their male& L1 m; s+ e! n
partners.6 However, when a shirt covered the applica-
% Q2 C: a- i7 c1 w6 M5 Y$ V7 [6 b+ ztion site, this testosterone transfer was prevented.; L, K3 i& Z( X' j* I( v: {7 x) d
Our patient’s testosterone level was 60 ng/mL,
/ i" g3 V6 t* ~8 |which was clearly high. Some studies suggest that! A; W% ]0 U; s- e1 v1 w# t9 a, X
dermal conversion of testosterone to dihydrotestos-
7 R5 c: k$ o4 V( Cterone, which is a more potent metabolite, is more6 M. U2 a7 [3 a+ f2 e# }/ U$ s
active in young children exposed to testosterone1 i% P" q7 Y) U* k
exogenously7; however, we did not measure a dihy-2 m( x$ ^9 [" Z: g
drotestosterone level in our patient. In addition to/ x0 N1 F. J5 l
virilization, exposure to exogenous testosterone in
6 J' z, [3 t% o5 @! I, schildren results in an increase in growth velocity and
9 V" L8 V) d: \ a0 Iadvanced bone age, as seen in our patient.
+ d- A6 T0 ~1 W/ W# jThe long-term effect of androgen exposure during
" M8 b; Q+ O7 u @) t: K1 eearly childhood on pubertal development and final% l6 l) _) b% w1 O1 Z; Q, q! s
adult height are not fully known and always remain; r5 A- s' X, m3 M8 N# |8 H0 f
a concern. Children treated with short-term testos-
7 n# f0 k( k4 Z4 r5 x3 {9 E' ^) p" Hterone injection or topical androgen may exhibit some
# B' z, n0 o; E7 T9 h6 a5 lacceleration of the skeletal maturation; however, after) F, l5 Q& ]* Z2 e$ d# V- u
cessation of treatment, the rate of bone maturation! V) U* \+ m' I1 u5 T
decelerates and gradually returns to normal.8,9 ^6 f( q" _4 c8 O
There are conflicting reports and controversy- y1 f( \8 R. u" C1 ]3 E
over the effect of early androgen exposure on adult/ _7 P* U( o7 s ]. t
penile length.10,11 Some reports suggest subnormal' V8 i5 q% v8 i
adult penile length, apparently because of downreg-+ l, K& |3 P8 C4 o- s
ulation of androgen receptor number.10,12 However,
) G* ~$ w* W# i( N* ~ MSutherland et al13 did not find a correlation between
3 a3 A/ l+ S( ]% hchildhood testosterone exposure and reduced adult0 U; s. e i$ U7 v8 t! q& @
penile length in clinical studies.. A0 S/ s# b8 ~1 G) S. F
Nonetheless, we do not believe our patient is
5 x" h0 j+ Y* B# ~3 Cgoing to experience any of the untoward effects from
* z6 r# V4 B# Stestosterone exposure as mentioned earlier because
* @! s/ _1 }( w8 y) Y( P3 |& [the exposure was not for a prolonged period of time.
; o, m: E8 t; n# d+ p2 h$ QAlthough the bone age was advanced at the time of
8 I& F6 h/ B6 y& ~diagnosis, the child had a normal growth velocity at! T) E; M1 M/ M1 {2 c l9 Z
the follow-up visit. It is hoped that his final adult
' R& Y; J# f7 H5 [: q( Dheight will not be affected.% q q+ J& G, s) A8 u
Although rarely reported, the widespread avail-8 g( x! g, }# Y. {* C8 h P" u* \
ability of androgen products in our society may6 \& ?+ u D5 ^+ C
indeed cause more virilization in male or female
: g: p- P' ~" c- Qchildren than one would realize. Exposure to andro-* n5 ~5 `( ^0 Y. @7 P* b
gen products must be considered and specific ques-4 L* m! |# f& P: g$ Z
tioning about the use of a testosterone product or; m/ b& e8 @5 d8 T4 ~% I
gel should be asked of the family members during
3 ?/ ^0 ~6 F4 Pthe evaluation of any children who present with vir-. V+ a e N; @* X6 u1 d M
ilization or peripheral precocious puberty. The diag-+ G! W7 m2 R7 u' l
nosis can be established by just a few tests and by
" u# m) B( M- O; w6 ^appropriate history. The inability to obtain such a
" y L8 u% }: w. {" W# n. xhistory, or failure to ask the specific questions, may: ]8 Q+ J- F* g) z. C
result in extensive, unnecessary, and expensive* D/ g6 Z' ^1 n
investigation. The primary care physician should be
4 J' G+ v/ O4 Z1 u4 E) Eaware of this fact, because most of these children/ {; K& S9 \% ?; [$ X! ]& _! l& G
may initially present in their practice. The Physicians’: S: R% r R* [
Desk Reference and package insert should also put a# o3 ]( k$ C; a. A+ S+ Q5 @+ E
warning about the virilizing effect on a male or
1 L1 M. L( m# A- Q9 s7 bfemale child who might come in contact with some-
4 C) g$ o( U+ I8 Fone using any of these products.' d& p$ l) T* }/ |# U/ {
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puberty in children with tumours of the suprasellar pineal
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Economics Company, Inc; 2004:3239-3241.( \3 F/ V4 x9 i2 q7 o) [- _
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testosterone and gonadotropin. J Urol. 1978;119:5 V3 U1 W8 p* I9 ?' v# W# P* P; i
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1 G/ A1 _5 z/ E3 m8. Guthrie RD, Smith DW, Graham CB. Testosterone
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